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Questions tagged [audio-engineering]

43 questions
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Is there a mechanical equivalent to a hi/low pass filter (as in electrical engineering)?

I have been wondering if there are certain media (for instance glass, air, foam, etc.) which are peculiar given their chemical composition and/or structure allowing them to filter out mechanical waves (examples include: sound, vibrations) of high or…
Marc Pelland
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Is active noise cancellation useful in vehicles?

The cabin noise of vehicles is a large concern in the luxury market. Why haven't any automakers used the same techniques as are employed in active noise cancelling headphones. In these devices a microphone is used as an in-loop sensor to suppress…
Chris Mueller
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Making my microcontroller transmit audio to any bluetooth headphones/speakers

I am creating a microcontroller on a custom PCB design for an MP3 player. I would like to consider integrating bluetooth into it. When I say integrating bluetooth into it, I specifically mean transmitting the chosen song on my custom MP3 player to…
Trever Wagenhals
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1 answer

What is that airplane headphone socket?

I recently flew on a A380 and I saw this interesting socket. Could someone explain to me what is the purpose of these 4 golden connections?
nowox
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3
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What type of test signal is appropriate for frequency response analysis of string instruments?

I want to test the frequency response of stringed musical instruments . My test set-up includes a piezo film transducer which is just taped onto the instrument and fed a signal which then vibrates the instrument. The resulting sound is picked up by…
William Hird
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Why would a "delayed loudspeaker" be so expensive in the 1970s?

Recently, I read about some major musical concert held somewhere in the USA to a record-large audience. Since there were so many people, not all could see or even hear the music from the main loudspeakers. Therefore, they put additional loudspeakers…
Silven B.
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Arduino DAC to Speaker

I'm working with an Arduino Due's two DAC pins. I want to output to a single 4W 5.7Ohm speaker to test my code, with the intent of eventually outputting to a set of speakers (woofer, mid-range, and tweeter) for better quality for frequencies between…
Richard Bernard
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Acoustical Design considerations for Active Noise Cancellation Project for Air vent

I am working on ''Active noise cancellation for air vent'' project. I am using NI myRIO1900 it has FPGA module(Xylinx Z-7010) , Audio Technica ATR 3350 omni directional microphones and Tevion Loudspeakers. I have done the programming using LabVIEW .…
charansai
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Is it possible for a microphone/sensor to detect soundwaves before it physically reaches the sensor?

I'm sorry if this is the wrong place to ask. I understand that for typical microphones, the sound waves need to physically reach the microphone and cause vibrations in the diaphragm before an electrical signal can be created. My question is, is…
Ymi
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Why does audio equipment buzz/humm when a long signal cable is used and how do I eliminate it?

I have two 5.1 speaker sets, one in the front and one in the back of my living room. I have connected them together with an "audio wire" (non-shielded unfortunately) that's 12 meters in length. Since I did this, the speakers started buzzing/humming…
Gizmo
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Acoustic transmission through houseboat hulls

The short version is: should I be worried about bass transmission through water into my neighbors' hulls? I am renovating a small houseboat (12x30 ft) to live on. It is one large room, and I plan on putting my reasonably large hifi system into it…
NauticalN
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Why do the "LINE OUT" connectors not seem to output audio, but "HEADPHONE JACK" does?

I have a "Clas Ohlson TCD-983WEC CDMP3". It's a cheap "multi-unit" music player bought maybe 10 years ago or longer. I'm using it exclusively for its (cheap) tape player, since my original tape player has sadly stopped working. I'm trying to…
J C
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Is it possible to measure the "noise level" of an area without using actual microphones which can record actual audio?

In a way, I wish that the government had put up noise level measuring equipment in every populated area of the country, allowing me to see on a map which areas are the most quiet and peaceful over time. Sadly, this screams "surveillance nightmare"…
Aggie S.
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How can I calculate the total signal level (noise) of PC fans?

I have a fan on a PC case running at 100% speed making 40dB/A of noise (sound pressure). Then I add a second fan right next to it running at 100% speed making 30dB/A of noise. What is the combined noise level? What happens if add and extra 50dB/A…
Vulkan
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What causes the hiss from one audio source but not another over long cable?

I have pulled some CAT6 through the ceiling from one room to a nearby cupboard, for line level audio signal. See wiring: I haven't used a balun or DI box, and there isn't TOO much hum and hiss, it's manageable. But something strange is happening…
hazymat
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